A Tape Looper Simulation with two parallel “reels” that are slightly running out of sync. Record a loop using the left stomp switch. Reel#1 goes a bit too fast, but you can slow it down by hitting the middle stomp switch just a fraction of a second. If you remain standing on the middle stomp switch it will take Reel#1 down to half time. Reel#2 will change direction each time you hit the right stomp switch. This will also put both reels back in sync again.
This is a mono version: left in, left out. But you may easily assign the two reels to two stereo channels if you prefer.
Have fun!